HIGH-STRENGTH GALVANIZED STEEL SHEET HAVING SUPERIOR BENDABILITY AND METHOD FOR PRODUCING SAME

WIPO Patent Application WO/2013/018739

A1

This high-strength galvanized steel sheet has a maximum tensile strength of at least 900 MPa and results from forming an alloyed galvanizing layer on the surface of a parent material steel sheet containing C, Si, Mn, P, S, Al, N, and O at predetermined quantities, the remainder comprising iron and unavoidable impurities. In the structure of the parent material steel sheet, residual austenite is limited to no greater than 8% by volume fraction; the kurtosis (K*) of the hardness distribution between the 2% hardness and the 98% hardness is no greater than 0.30; the ratio of the Vickers hardness of the surface layer of the parent material steel sheet and the Vickers hardness at 1/4 the thickness of the parent material steel sheet is 0.35-0.70, and the amount of iron contained in the alloyed galvanizing layer is 8-12% by mass%.

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KAWATA HIROYUKI (JP)
MARUYAMA NAOKI (JP)
MURASATO AKINOBU (JP)
MINAMI AKINOBU (JP)
YASUI TAKESHI (JP)
KUWAYAMA TAKUYA (JP)
YONEMURA SHIGERU (JP)

PCT/JP2012/069260

February 07, 2013

July 27, 2012

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NIPPON STEEL & SUMITOMO METAL CORP (JP)
KAWATA HIROYUKI (JP)
MARUYAMA NAOKI (JP)
MURASATO AKINOBU (JP)
MINAMI AKINOBU (JP)
YASUI TAKESHI (JP)
KUWAYAMA TAKUYA (JP)
YONEMURA SHIGERU (JP)

C22C38/00; B21B3/00; C21D9/46; C22C38/06; C22C38/58; C23C2/06; C23C2/26; C23C28/00; C22C18/00

JP2011111675A	2011-06-09
JP2009228128A	2009-10-08
JP2010150580A	2010-07-08
JP2007009317A	2007-01-18

See also references of EP 2738280A4

HAGIWARA, Yasushi et al. (JP)
Yasushi Hagiwara (JP)

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